A big part of the appeal of Synology was that you could just forget about it . I have a little one in the corner that's just been sitting there serving files out over SMB for years now. It doesn't need to do anything more and I don't need to think about it. A lot of the alternatives being proposed are not so easy to maintain. A full general purpose OS install doesn't really take care of itself. And I don't have (and…
I want a small reliable box that I just put in the corner and I can forget about for months at a time, as long as it provides me the services I configured it for. I access my NAS UI maybe once every 3 months.
I know exactly how to roll my own NAS (and I'm already rolling my own router), but I just don't want to deal with operating it.
Synology still scores very high on this single metric.